Solenoid Valve - Test - Solenoid Valves that Connect to the Dosing Control Unit (DCU)
注: 本步骤涉及以下故障诊断代码：
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| 电磁阀诊断代码 | ||
| J1939 代码和描述 | 代码的前提条件 | 注释 |
| 3363-3
后处理 #1 DEF 罐加热器：电压高于正常值 |
蓄电池电压正常 - 钥匙开关信号（ECM：V13 和 V33，DCU：18 端子）持续激活超过 2 秒 - 除起动马达停止后 2 秒外，起动马达开关信号（ECM：V12 端子）未处于激活状态 - DCU 和发动机 ECM 之间的 CAN 通信正常 - 在 DCU 通电后 160 秒内未完成诊断 |
线束的 +B 短路 冷却液阀线圈的 +B 短路 当高压侧开关断开时，冷却液阀端子监视电压 (1) 为 1.937 V 或以上（仅在 DCU 电源接通后）持续至少 80 秒。 停止冷却液阀 |
| 3363-4
后处理 #1 DEF 罐加热器：电压低于正常值 |
线束对接地短路或开路 冷却液阀线圈对接地短路或开路 当高压侧开关接通时，冷却液阀端子监视电压 (*1) 为 0.503 V 或以下。 （仅在 DCU 电源接通后）持续至少 80 秒 停止冷却液阀 |
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| 3363-5
后处理 #1 DEF 罐加热器：电流低于正常值 |
线束开路 冷却液阀加热器线圈开路 当高压侧开关接通时，冷却液阀端子监视电压 (1) 为 0.503 V 或以上以及 1.937 V 或以下。 （仅在 DCU 电源接通后）持续至少 80 秒 停止冷却液阀 |
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